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Reviewed by our in-house tax team before publishing. Every figure is validated against:
Last reviewed: November 6, 2026
Wisconsin estimated tax payments for 2026 are due April 15, June 15, September 15, 2026, and January 15, 2027, and you must make them if you expect to owe at least $500 of Wisconsin income tax after withholding and credits. With three dates behind you, the live installment is January 15, 2027, paid free through the Department of Revenue's Quick Pay or My Tax Account, or with a Form 1-ES voucher. The safe amount is the smaller of 90% of your 2026 tax or 100% of your 2025 tax; anything short accrues 12% annual interest on Schedule U.
Key takeaways:
Save this cheat sheet — Wisconsin's 2026 numbers in one image.
The Wisconsin Department of Revenue (DOR) uses the federal calendar and four equal installments, per the 2026 Form 1-ES instructions:
| Installment | Due date | Status |
|---|---|---|
| 1 | April 15, 2026 | Passed |
| 2 | June 15, 2026 | Passed |
| 3 | September 15, 2026 | Passed |
| 4 | January 15, 2027 (a Friday) | Open |
If you only became liable partway through the year, Wisconsin does not ask you to backfill. Crossing the line after March 31 means half the year's estimate by June 15; after May 31, three-quarters by September 15; after August 31, the whole amount by January 15, 2027. A due date that lands on a weekend or legal holiday moves to the next business day. The calendar matches federal Form 1040-ES, and our estimated tax due-dates page lists both.
The 1-ES also offers a January shortcut with a catch. If you file your 2026 Form 1 by January 31, 2027 and pay the full balance, that payment counts as the January 15 installment, but only if you owed no estimated tax for September 15 or earlier. In practice it helps people whose income arrived late in the year; a freelancer who owed all along still needs the January voucher.
For 2027, the dates are April 15, June 15, and September 15, 2027, then January 18, 2028: January 15, 2028 is a Saturday, and Monday the 17th, the third Monday in January, is a legal holiday under Wis. Stat. § 995.20.
You must pay Wisconsin estimated tax for 2026 if you expect to owe at least $500 after subtracting withholding and credits, and your withholding will be less than the smallest of 90% of your 2026 tax, 100% of your 2025 tax from a 12-month return, or 90% of annualized 2026 tax. Self-employment income, interest, dividends, unemployment compensation, and taxable pensions are the income types DOR names.
Residency does not change the rule. Part-year residents and nonresidents with Wisconsin-source income and no Wisconsin withholding must make estimates too, according to DOR's estimated payments FAQ, even if they had no Wisconsin filing requirement last year.
The one clean exemption is narrow: if you were a full-year Wisconsin resident for 2025 and had no tax liability for that 12-month year, you do not have to pay 2026 estimates. It does not extend to someone who lived elsewhere in 2025, which matters for anyone who moved to Madison or Milwaukee this year to freelance. Spouses can pay jointly or separately and still choose either filing status later; separate payments can go toward a joint return, but one spouse's payments cannot cover the other's separate liability.
Wisconsin has four brackets. 2025 Wisconsin Act 15 widened the 4.4% bracket, and the 2026 amounts are indexed:
| Taxable income, single or head of household | Married filing jointly | Rate |
|---|---|---|
| $0 – $15,110 | $0 – $20,150 | 3.5% |
| $15,110 – $51,950 | $20,150 – $69,260 | 4.4% |
| $51,950 – $332,720 | $69,260 – $443,630 | 5.3% |
| Over $332,720 | Over $443,630 | 7.65% |
The standard deduction slides down as income rises. A single filer gets $13,960 up to $20,119 of Wisconsin income, minus 12% of every dollar above $20,120, reaching zero at $136,453; joint filers start at $25,840 and lose 19.778% of income above $29,040. Each exemption is $700. For 2027, the April 2026 Wisconsin Tax Bulletin 233 lists no rate or bracket change among the session's new laws.
Birgit, a wedding photographer in Madison, files single and expects $64,500 of 2026 Wisconsin income after the deductible half of self-employment tax:
| 1-ES worksheet step | Amount |
|---|---|
| Line 1: Wisconsin income | $64,500 |
| Standard deduction: $13,960 − 12% × ($64,500 − $20,120) | −$8,634 |
| Exemption | −$700 |
| Line 3: Taxable income | $55,166 |
| Line 4: Tax: $2,149.81 + 5.3% × ($55,166 − $51,950) | $2,320 |
For the federal and self-employment tax that ride alongside, the Wisconsin quarterly tax calculator handles all three from one set of inputs.
You owe no underpayment interest when your timely estimates and withholding reach the smaller of:
| Option | Required total | Catch |
|---|---|---|
| Current year | 90% of your 2026 tax | Measured against the tax on your filed return |
| Prior year | 100% of your 2025 tax | Requires a 12-month 2025 Wisconsin return; unavailable if you filed none |
| Annualized | 90% of annualized tax | Uneven income, computed on Schedule U Part IV |
Wisconsin has no 110% rule for high earners, unlike Minnesota, which follows the federal 110% tier. Birgit's 2025 Wisconsin tax was $2,000. Her options are 90% × $2,320 = $2,088 or 100% × $2,000 = $2,000, so she pays four installments of $500 and settles the remaining $320 with her 2026 Form 1 by April 15, 2027, interest-free.
Interactive
What should each Wisconsin installment be?
Enter your expected 2026 Wisconsin income (1-ES worksheet line 1), filing status, Wisconsin withholding, and your 2025 Wisconsin tax. The tool applies the sliding standard deduction and 2026 rates, then picks the smaller safe harbor.
Federal AGI with Wisconsin additions and subtractions.
Include pass-through withholding from a 3K-1 or 5K-1.
Net tax on your 2025 Form 1. Enter 0 if none or no return.
Each of your four installments
$500
Set by 100% of your 2025 tax. Protected even if 2026 comes in higher.
2026 Form 1-ES instructions and 2025 Schedule U. Assumes one $700 exemption per filer, no dependents, no credits. No estimates when 2026 tax minus withholding is under $500. Safe harbor is the smaller of 90% of 2026 tax or 100% of 2025 tax; the prior-year option needs a 12-month 2025 Wisconsin return. Underpayment interest is 12% a year, figured per installment.
Add federal and self-employment taxWisconsin's online options run through My Tax Account at tap.revenue.wi.gov. Quick Pay at tap.revenue.wi.gov/pay is free for bank payments. Credit card, Apple Pay, and PayPal go through DOR's third-party processor at the same address, for a $1 transaction fee plus a 2.25% processing fee.
To pay by check, complete the interactive Form 1-ES voucher, make the check payable to the Wisconsin Department of Revenue, and mail it unstapled with the voucher to:
Wisconsin Department of Revenue PO Box 3028 Milwaukee, WI 53201-3028
That is the 1-ES address on DOR's mailing addresses page; the PO boxes for Form 1 returns are different. Personalized vouchers are available at (608) 266-1961.
DOR's free ES Lookup at tap.revenue.wi.gov/ESLookup shows the estimated payments available to claim on your return, along with credit carryforwards, extension payments, and W-200 prepayments. Run it before you file: if the amount you claim does not match DOR's records, an e-filed return can be rejected. When the lookup disagrees with your records, the usual culprits are a payment applied to the wrong year or a carryforward changed by an adjustment to your 2025 return.
Wisconsin charges interest, not a separate penalty, on short installments. Schedule U multiplies each underpayment by the days late × 12% ÷ 365, from the installment's due date until you pay or April 15, 2027, whichever is earlier. The IRS rate for the fourth quarter of 2026 is 7%, so the same delay costs noticeably more in Madison than on the federal Form 2210.
Suppose Birgit skipped her $500 September 15 installment:
| Catch-up date | Days late | Math | Interest |
|---|---|---|---|
| January 15, 2027 | 122 | $500 × 12% × 122 ÷ 365 | $20 |
| April 15, 2027, with her return | 212 | $500 × 12% × 212 ÷ 365 | $35 |
If she had paid nothing all year and sent $1,500 for the three missed quarters on January 15, 2027, the interest would come to about $100. Schedule U also lists waiver codes for casualty or disaster, for people who retired after age 62 or became disabled in the current or prior year with reasonable cause, and for military service outside the continental United States.
Social Security benefits are not taxable in Wisconsin. 2025 Wisconsin Act 15 added a subtraction of up to $24,000 of qualified retirement income ($48,000 for certain joint filers) for anyone 67 or older at year-end, per DOR Publication 106, but claiming it means giving up every Wisconsin income tax credit that year. A retiree who ran the numbers with credits in 2025 may owe more, or less, than expected in 2026, and pension income without withholding is exactly the income the 1-ES targets.
Wisconsin counties add sales tax, not income tax, so the 1-ES is the only state-level estimate. Neighboring Illinois uses a $1,000 trigger, double Wisconsin's $500, which trips up people who live on one side of the border and work on the other. Building Jupid, I keep meeting freelancers who budget Wisconsin tax at the 5.3% bracket rate. In the phase-out range each extra dollar of income also cuts a single filer's standard deduction by 12 cents, so the real marginal rate is closer to 5.9%.
Wisconsin's sliding standard deduction means your tax moves with every invoice, so a spring estimate drifts by fall. Jupid connects to your business bank account and categorizes income and expenses with 95.9% accuracy as they post, which keeps your 2026 profit current for line 1 of the 1-ES worksheet. Ask the AI accountant in WhatsApp or iMessage how much you have earned this year and what is set aside for taxes, and the answer arrives in the chat in real time. Try Jupid.
This guide is for general educational purposes and does not constitute tax, legal, or accounting advice. It reflects the 2026 Form 1-ES instructions, the 2025 Schedule U, and DOR guidance as reviewed 2026-10-29; worked examples use the rate schedules rather than DOR's tax table and assume no credits. For advice specific to your situation, consult a qualified tax professional or the Wisconsin Department of Revenue at revenue.wi.gov.
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Fintech CEO with 10+ years building accounting and financial technology products. Previously co-founded and scaled an AI-powered accounting platform to $30M revenue and 100K+ business users, achieving 30,000 customers per accountant through automation — recognized by CNBC as a top fintech company. Holds a Master's in Management Information Systems. At Jupid, he leads the development of AI-native bookkeeping, tax, and compliance tools designed for freelancers and small business owners.
Maine estimated tax payments 2026: 1040ES-ME due dates, the two-part $1,000 trigger, 90%/100% safe harbor, the new 2% surcharge, and the 9% penalty rate.
Oklahoma estimated tax payments 2026: OW-8-ES due dates, the $500 trigger, a 70%/100% safe harbor, the new 4.5% top rate, and 20% underpayment interest.
Kansas estimated tax payments 2026: last K-40ES installment due Jan 15, 2027, $500 trigger, 90%/100% safe harbor, 5.2% and 5.58% rates, 8% K-210 penalty.
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